package org.javacore.rtti;

import java.util.Random;

/*
 * Copyright [2015] [Jeff Lee]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *  * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @author Jeff Lee
 * @since 2015-11-2 16:43:41 Class初始化案例
 */
class Initable {
	static final int staticFinal = 47;
	static final int staticFinal2 = ClassInitialization.random.nextInt(1000);

	static {
		System.out.println("Initializing Initable");
	}
}

class Initable2 {
	static int staticNonFinal = 147;

	static {
		System.out.println("Initializing Initable2");
	}
}

class Initable3 {
	static int staticNonFinal = 74;

	static {
		System.out.println("Initializing Initable3");
	}
}

public class ClassInitialization {
	public static Random random = new Random(47);

	@SuppressWarnings({ "unused", "rawtypes" })
	public static void main(String[] args) throws ClassNotFoundException {
		// 类中有编译期常量 static Final,则暂时不需要初始化
		Class initable = Initable.class;
		System.out.println("After creating Initable ref");
		System.out.println(Initable.staticFinal);
		// 调用非编译期常量，强制进行类Initable初始化
		System.out.println(Initable.staticFinal2);

		// 先进行初始化
		System.out.println(Initable2.staticNonFinal);

		// 无编译期常量，直接初始化
		Class initable3 = Class.forName("org.javacore.rtti.Initable3");
		System.out.println("After creating Initable ref");
		System.out.println(Initable3.staticNonFinal);
	}
}
